When I installed my muffler and put it on the dynamometer I had only driven the truck I think about 150-200 miles. The air fuel ratio was overly rich and off the charts. When I installed the stock exhaust back on it climbed back up to about 11.2 to 1. I suspect that when AEM installed their intake and made there runs they didn’t get the kind of power they expected because the computer in the Tundra richens the air fuel mixture and then relearns the proper ratios over time. If they had allowed about 500 miles of driving they might see that the gains could be much more.
When I installed my headers I was disappointed when I first drove the truck because I could not feel a difference in power. After driving the truck a few hundred miles the difference was becoming more and more apparent after every new start cycle. Even though setting up the truck on the dynamometer can skew the results a little I think if you did it again after 1000 miles of driving you would see bigger gains.
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stock exhaust
Formerly Modified JBA headers now SSautochrome headers temporarily
TRD LSD
Extang lift off tonneau
Hankook DynaPro AS RH03
stock air filter & box
220 HP @ 4800 RPM
302 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, stock air filter, and JBA headers
208 HP @ 4800 RPM
285 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, TRD air filter, and stock manifolds
204 HP @ 4800 RPM
271 TQ @ 3400 RPM Bone stock
Quarter mile 15.526 @ 87.17 mph bone stock in 40-degree weather 2WD SR5 V8.
Quarter mile 15.389 @ 88.66 mph modified in 60-degree weather 2WD SR5 V8.
0-60 IN 6.88 seconds on G-tech
Dyno run results click here
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